Lichform does not change donator tile if used

git-svn-id: http://svn.net-core.org/repos/t-engine4@6401 51575b47-30f0-44d4-a5cc-537603b46e54

game/modules/tome/data/talents/spells/necrosis.lua

@@ -155,10 +155,12 @@ newTalent{
 		self.has_used_lichform = true
 		self.descriptor.race = "Undead"
 		self.descriptor.subrace = "Lich"
-		self.moddable_tile = "skeleton"
-		self.moddable_tile_nude = true
-		self.moddable_tile_base = "base_lich_01.png"
-		self.moddable_tile_ornament = nil
+		if not self.has_custom_tile then
+			self.moddable_tile = "skeleton"
+			self.moddable_tile_nude = true
+			self.moddable_tile_base = "base_lich_01.png"
+			self.moddable_tile_ornament = nil
+		end
 		self.blood_color = colors.GREY
 		self:attr("poison_immune", 1)
 		self:attr("disease_immune", 0.5)